Maum dev lus ceeb toom cov maum dev ntxias noj ntxias haus dag noj dag haus lawv 90 ces lawv yeej tsis tso lawv cov duab tiag1 txiav lwm tug ntsej muag duab los rau lawv lub cev 2 txiav lub cev thiab ntsej muag rau lwm daim duab kom yus saib tsis paub chaw tom qab thiab kom yus tsis paub lawv nyob qhov twg lov lub zos twg 3 lawv cov duab tsawg tsawg xwb.